The manufacturer said from what they remember the prop. was at least 3X past the recommended overhaul date, and the crack started at the trailing edge. The student had inspected another aircraft first that had a prop. strike in Lake Whales after a student went off of the end of the runway there. The instructor, and I believe 2 students jumped back in the airplane, and flew it back, damaged prop. and all. That was highly illegal, and dangerous. The place is now Pan Am academy. If the same owners, and management are still involved, it's the same operation.